The daily assignment of a bus, numbered and listed in a master schedule. Each vehicle displays its bus run number. (TRB). The scheduled itinerary of trips a bus is supposed to make during the day. It is a package of trips. Dont confuse this with a Work Run, which is the scheduled itinerary of the bus operator. In our agency buses often stay in service a lot longer than operators; operators are scheduled to meet buses to relieve other operators (the operator who is relieved goes back to the Division in the car that the relieving operator brought to the meeting point).